Biology Chapter 4 - Part 2
- Created by: elliebaxter
- Created on: 23-01-17 20:49
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- Biology Chapter 4 - Part 2
- The effect of exercise on the body
- Muscles need more energy so they can contract
- You need to increase the rate at which oxygen and glucose reach the muscle cells
- Heart rate increases and blood vessels supplying the muscles dilate
- Allows more blood containing oxygen and glucose to reach muscles
- Breathing depth and rate increases to take in and let out more O2 and CO2
- Muscles store glucose as glycogen which can be converted back to glucose when exercising
- Muscles need more energy so they can contract
- Anaerobic respiration
- If you use your muscles over a long period, they will get tired and stop contracting efficiently
- The glucose is not completely broken down and lactic acid is produced
- Less energy is released from the glucose
- Blood flowing through the muscles removes the lactic acid
- (HUMANS) Glucose = lactic acid
- C6H12O6 = 2C3H6O3
- (PLANTS) Glucose = ethanol + carbon dioxide
- C6H12O6 = 2C2H5OH + 2CO2
- Some microorganisms such as bacteria produce lactic acid
- Oxygen dept
- When exercise has finished, the lactic acid must be completely broken down which needs a lot of oxygen
- The extra oxygen needed is known as oxygen dept
- Eventually oxygen oxidises lactic acid into CO2 and H2O
- Lactic acid + oxygen = carbon dioxide + water
- When exercise has finished, the lactic acid must be completely broken down which needs a lot of oxygen
- The effect of exercise on the body
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